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Injection molding machine

a molding machine and injection molding technology, applied in the field of injection molding machines, can solve the problems that the requirements cannot be satisfied by hydraulic systems, and achieve the effects of high rotation speed, increased rotation speed, and quiet operation

Inactive Publication Date: 2008-01-31
DEMAG ERGOTECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The present invention resolves prior art problems by providing a direct drive as electrical drive for implementing the injection stroke of the plasticizing screw, and by providing a direct drive for activating the spindle mechanism. The use of such direct drives results in a very quiet operation in view of the reduced number of individual components compared to electric drives which include combinations of electric motors and transmissions. A direct drive is also lightweight and compact. The need for frequent maintenance works is eliminated because only the bearings of direct drives are subject to wear, however to a much less extent when compared to wear to which the numerous components of transmissions are exposed. As a result, downtimes of an injection molding machine according to the invention are less frequent. In addition, due to the absence of a transmission, the need for a separate cooling circuit is eliminated, and there is no need for a supply of transmission oil so that the injection molding machine according to the invention is not only compact but operates cleanly and at little noise level. Direct drives can also be precisely operated so that the metering function assumed by the plasticizing screw becomes very effective and accurate.
[0026] An injection molding machine according to the present invention is especially suited for high-speed applications with the required high dynamics and includes an injection unit which is also suited for high-speed applications with the required high dynamics. The provision of a hydraulic accumulator system for various axles of an injection molding machine with hydraulic actuators in combination with the provision of direct drives for electrically driven axles allows all axles of the injection molding machine to be activated independently from one another in a rapid and precise manner, wherein this activation can be best suited via a control mechanism of the hydraulic accumulator system to a control mechanism of the injection molding machine and together to the demands of high-speed applications.

Problems solved by technology

These requirements cannot be satisfied by hydraulic systems, using simply a pump for pressurizing the hydraulic circuit.

Method used

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Embodiment Construction

[0028] The depicted embodiment is to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the drawing is not necessarily to scale and that embodiments are sometimes illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted.

[0029] Turning now to FIG. 1, there is shown a schematic sectional view of an injection molding machine according to the present invention, generally designated by reference numeral 1. The injection molding machine includes an injection unit which is generally designated by reference numeral 2, and a clamping unit, which is generally designated by reference numeral 40. The injection unit 2 has a plasticizing unit with a barrel 4 and a plasticizing screw 6, which is received in the barrel 4 for...

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Abstract

An injection molding machine includes an injection unit and a clamping unit. The injection unit includes a barrel and a plasticizing screw which is supported in the barrel for rotation and movement in axial direction. A first direct drive causes the plasticizing screw to rotate in order to plasticize thermoplastic material, and a hydraulic drive causes the plasticizing screw to move axially in order to effect an injection stroke. The hydraulic drive includes a hydraulic accumulator system which is comprised of a variable capacity pump in combination with a hydraulic accumulator. The clamping unit includes a toggle mechanism for moving a movable platen in relation to a stationary support platen, a spindle mechanism for operating the toggle mechanism, and a second direct drive for operating the spindle mechanism.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application is a continuation of prior filed copending PCT International application no. PCT / EP2005 / 051801, filed Apr. 22, 2005, which designated the United States and has been published but not in English as International Publication No. WO 2006 / 005638 and on which priority is claimed under 35 U.S.C. §120, and which claims the priority of German Patent Application, Serial No. 10 2004 033 690.3, filed Jul. 9, 2004, pursuant to 35 U.S.C. 119(a)-(d), the contents of which are incorporated herein by reference in its entirety as if fully set forth herein.BACKGROUND OF THE INVENTION [0002] The present invention relates, in general, to an injection molding machine. [0003] Nothing in the following discussion of the state of the art is to be construed as an admission of prior art. [0004] A typical injection molding machine includes an injection unit having a plasticizing screw which is caused to rotate by an electric drive for plasticizin...

Claims

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Application Information

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IPC IPC(8): B29C45/17B29C45/50B29C45/82
CPCB29C45/5008B29C45/82B29C2045/1794B29C2945/76785B29C2945/76083B29C2945/7623B29C2945/76498B29C2045/824
Inventor WESSELY, RALPHKUBEL, ANDREASPOPP, HANS-JURGEN
Owner DEMAG ERGOTECH GMBH
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